On Wed, Nov 30, 2016 at 11:58:06AM -0500, Lee wrote:
> On 11/30/16, Mikael Abrahamsson wrote:
> > If your switch is the typical small-buffered-switch that has become more
> > and more common the past few years, then the entire switch might have
> > buffer to keep packets for 0.1ms or less. So if s
On 11/30/16, Mikael Abrahamsson wrote:
> On Tue, 29 Nov 2016, TJ Trout wrote:
>
>> Is it possible to over run the buffers of a 320gbps backplane switch
>> with only 1.5gbps traffic? I think the switch is rated for 140m PPS and
>> I'm only pushing 100k PPS
>
> If your switch is the typical small-bu
On Tue, 29 Nov 2016, TJ Trout wrote:
Is it possible to over run the buffers of a 320gbps backplane switch
with only 1.5gbps traffic? I think the switch is rated for 140m PPS and
I'm only pushing 100k PPS
If your switch is the typical small-buffered-switch that has become more
and more common
If you have congestion on outgoing interfaces you are most likely
running out of packet buffer space on your switch. Especially campus
class switches have small buffers, 4 MB or so and it can run out during
high bursts and interface congestion. With some switches you could
alleviate problem by
. .
-Original Message-
From: NANOG [mailto:nanog-boun...@nanog.org] On Behalf Of Peter Beckman
Sent: Tuesday, November 29, 2016 5:10 PM
To: TJ Trout
Cc: nanog
Subject: Re: 10G switch drops traffic for a split second
On Tue, 29 Nov 2016, TJ Trout wrote:
> I plan on disabling FC on everyth
Yeah you also have to look for not so obvious things like MAC Pause
frames sent/received...QoS counters, all sorts of VERY platform
specific stuff. Right royal pain, especially since some do not expose
these statistics at all.
On Tue, Nov 29, 2016 at 3:10 PM, Peter Beckman wrote:
>
> On Tue, 29
On Tue, 29 Nov 2016, TJ Trout wrote:
I plan on disabling FC on everything tonight, I've done that before but I
want to be sure.
Anything that can be done about the 2 x 1G peers trunking to the 10G router
transition that can be fixed? should I be rate limiting the vlan for the
peers at 1G so th
I plan on disabling FC on everything tonight, I've done that before but I
want to be sure.
Anything that can be done about the 2 x 1G peers trunking to the 10G router
transition that can be fixed? should I be rate limiting the vlan for the
peers at 1G so the 10G router isn't trying to send more th
Yes it is absolutely possible to overrun the buffers. Any kind of
backpressure (FC) from hosts, or 10G->1G transitions can easily cause
it. Even if in a 10s window you're not over 1G if the 10G sender
attempts to back to back too many frames in a row (Like say sendfile()
API type calls) BOOM, dro
Luke;
All l2, no l3. only 4 vlans. 2 peers trunked to a router which trunks back
to 2 devices (microwave backhauls).
Chuck;
All ports are 10g except the 2 peers are 1g and trunk back to a 10g port
for the router wan
No TCN's
Brian;
I have tried a IBM G8124 and a Ubiquiti ES-16-XG both show sa
On Tue, 29 Nov 2016, TJ Trout wrote:
Could this be MTU? I've tried flow control, hard code duplex, stp on/off
etc
As others have pointed out, you probably have a switch with small buffers.
If you also have flow control and you have something that triggers flow
control to turn off packet forw
On Tue, 29 Nov 2016 09:06:00 +
TJ Trout wrote:
> Could this be MTU? I've tried flow control, hard code duplex, stp on/off etc
> I'm at a loss any ideas?
This sounds like a common problem that certain data center environments
run into with 10 Gb/s and higher loads. In a nutshell, a simple
th
Without more detail, I'm grasping at straws here, but see this recent
thread about QoS and microbursts on the juniper-nsp list:
https://puck.nether.net/pipermail/juniper-nsp/2016-November/033692.html
Do you have ports with different speeds connected?
Another idea: Are you using Spanning Tree Pro
esday, November 29, 2016 3:06 AM
To: nanog@nanog.org
Subject: 10G switch drops traffic for a split second
I recently upgraded my core network from 1G to 10G and after the upgrade I have
noticed that my 10G switch during peak traffic (1500mbps, 100,000pps) seems to
be dropping traffic for a split second a
I recently upgraded my core network from 1G to 10G and after the upgrade I
have noticed that my 10G switch during peak traffic (1500mbps, 100,000pps)
seems to be dropping traffic for a split second across all ports and all
vlans. I immediately replaced the switch with a different brand/model and
th
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